Site not working with browser Content Type set to "WML" or "WML & HTML"?

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I have a web mail portal I'd like to access that unfortunately seems to freeze when my browser Content Type is set to my usual default, WML & HTML, or setting it to WML only. When I set the content type to HTML everything works fine, but this setting seems to be per-browser and not per-site so I don't want to change it from the default.

Does anyone know why this might be happening? Perhaps with the "WML & HTML" setting the BB tries to get WML first and is getting hung up on the Javascript in the page or something? (Note the Javascript causes no problems for the BB when I set the Content Type to HTML Only).

Incidentally I can process this page with Skweezer and get everything to work (Google Mobilizer gave me a message saying it wouldn't process the page), so if you're having these kinds of problems give Skweezer a try.